Non-Latching Relays

Relays are electrical switches that are operated by electrical impulses with the primary function to open and close a circuit, they can also be referred to as industrial switches. There are 2 main types available, latching and non–latching relays.


How do non-latching relays work?


Non-latching relays are in a normally closed (NC) position and will stay in this state without power. When power passes through the circuit, the relay switched to a normally open (NO) position by using an internal coil to generate a magnetic force, holding this NO position. Once the current is turned off, it returns to the NC position. This makes non-latching relays well suited to push-button applications like keyboards and micro-controller input buttons.


What are non-latching relays used for?


Non-latching relays are highly durable and versatile components, making their performance long lasting and suitable for use in a wide range of applications, such as:


  • Automotive engines

  • Household appliances

  • Industrial machinery

  • Medical equipment

  • Telecommunications equipment

What is the difference between latching and non-latching relays?


Both types of relays in similar in design and function, however, a significant difference between them is that a latching relay will remain in the last position it when it was last powered, whereas a non-latching goes back to its normal position. This makes each more type of relay suitable for different applications.


Considerations when selecting a relay


When choosing a relay, it is important to consider a number of specifications to ensure it is fit for purpose, some factors include:


  • Coil voltage - the required voltage to actuate the switching mechanism. If a voltage is too high this could damage the components, if it is too low then it will not actuate.

  • Contact configuration - This is the state the contacts are in without power. For example SPST, single pole single throw.

  • Contact material - the relay contacts are available in many materials that have certain properties. Common materials are gold, silver, tin oxide and nickel

  • Coil power - the amount of power (watts) the coil operates at. This must match the power in the circuit for correct function.

  • Coil resistance - the amount of resistance (ohms) in the circuit that the coil creates.


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Description Price Coil Voltage Coil Power Contact Configuration Coil Resistance Mounting Type Switching Current Isolation Coil To Contact Terminal Type Series Maximum Switching Voltage AC Maximum Switching Voltage DC Application Number of Poles Length
RS Stock No. 790-3313
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BrandFujitsu
TWD101.00
Each
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24 V 530mW DPDT 1.1 kΩ PCB Mount 5A 10kV PCB Pin - 400V ac 300V dc - - 29mm
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TWD137.00
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5 V dc 140mW DPDT 178 Ω PCB Mount 2A 1.5kV PCB Pin - 125V ac 110V dc - - 14mm
RS Stock No. 790-3388
Mfr. Part No.FBR53ND12-Y-HW
BrandFujitsu
TWD83.00
Each
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12 V dc 860mW SPST 167 Ω PCB Mount 40A - PCB Pin - - - - - 15.7mm
RS Stock No. 790-3335
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BrandFujitsu
TWD104.00
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12 V dc 400mW SPDT 360 Ω PCB Mount 16A 10kV PCB Pin - 440V ac 300V dc - - 29mm
RS Stock No. 790-3363
Mfr. Part No.SY-12-K
BrandFujitsu
TWD81.00
Each
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12 V dc 150mW SPDT 960 Ω PCB Mount 1A 1.5kV PCB Pin - 120V ac 60V dc - - 12.5mm
RS Stock No. 790-3300
Mfr. Part No.A-12W-K
BrandFujitsu
TWD103.00
Each
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12 V dc 140mW DPDT 1.028 kΩ PCB Mount 2A 1.5kV PCB Pin - 125V ac 110V dc - - 14mm
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Mfr. Part No.FTR-H1CA012V
BrandFujitsu
TWD62.00
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Mfr. Part No.NA-12W-K
BrandFujitsu
TWD95.00
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BrandFujitsu
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BrandFujitsu
TWD135.00
Each
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4.5 V dc 140mW DPDT 145 Ω Surface Mount 1A 2.5kV PCB Pin - 250V ac 220V dc - - 10.6mm
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BrandFujitsu
TWD103.00
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6 V dc 300mW SPNO 120 O PCB Mount 5A 10000 (Surge)V PCB Pin JV 250V ac 150V dc - 1 17.8mm
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Mfr. Part No.FTR-K1AK024T
BrandFujitsu
TWD99.00
Each
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24 V 400mW SPST 1.44 kΩ PCB Mount 16A 10kV PCB Pin - 440V ac 300V dc - - 29mm
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TWD92.50
Each (In a Tube of 50)
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4.5 V dc 140mW DPDT 145 O Surface Mount - - PCB Pin FTR-B3 250V ac 220V dc - 2 10.9mm
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Each (In a Tube of 40)
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BrandFujitsu
TWD110.00
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4.5 V dc 140mW DPDT 145 O Surface Mount - - PCB Pin FTR-B3 250V ac 220V dc - 2 10.9mm